[win] Including missing net_dgrm.c file in Makefile.libretro build
Attempt to fix compile error: `m_state` undeclared variable
[win] Fixed mingw32 compile error: 'client_s' undeclared identifier
Fixed mingw compile error introduced in 0a482f255: 'm_state_enum' undeclared identifier, explicit cast isn't necessary so only include it when MSVC C++ fix is needed
Sync MSVC output DLL name with library from libretro-super script (libretro-tyrquake.so)